Drop unneeded become overrides

We add become overrides on the task level which neglect provided by
user options in favor of quite narrow usecase. As a result, role can not
be run as a non-root user in cases where venv_build_host is not localhost

Removing become override potenially unblocks running OSA with non-root
user on hosts.

Change-Id: I663bdb1bcc60fec0d9efc55cbb1b2a0c566ab2ab

tasks/python_venv_install.yml

@@ -15,7 +15,6 @@
 
 - name: Slurp up the constraints file for later re-deployment
   delegate_to: "{{ venv_build_host }}"
-  become: "{{ venv_build_host == 'localhost' }}"
   slurp:
     src: "{{ _venv_build_requirements_prefix }}-constraints.txt"
   register: _constraints_file_slurp

tasks/python_venv_set_facts.yml

@@ -14,14 +14,12 @@
 # limitations under the License.
 
 - name: Ensure local facts folder exists
-  become: true
   file:
     path: /etc/ansible/facts.d
     state: directory
     mode: "0755"
 
 - name: Record the necessary facts
-  become: true
   ini_file:
     dest: "/etc/ansible/facts.d/{{ venv_facts_dest }}.fact"
     section: "{{ item.section }}"

tasks/python_venv_wheel_build.yml

@@ -15,7 +15,6 @@
 
 - name: Build the wheels on the build host
   delegate_to: "{{ venv_build_host }}"
-  become: "{{ venv_build_host == 'localhost' }}"
   block:
     - name: Install distro packages for wheel build
       vars: